feat(ipld/merkledag): add total size of visited nodes in progress tracker

[vlerdman]

This PR adds tracking total size of nodes during graph walk. New code saves backward compability with ipfs/kubo.

Changes

• Extend merkledag.ProgressTracker to save and update TotalSize of visited nodes
• Update progress via wrapping GetLinksDirect function instead of visit
• Update testProgressIndicator for checking TotalSize

References

• Closes: Add total size of pinned objects to pin add progress reports. kubo#8915

[lidel]

@vlerdman thank you for submitting this – any chance you could also:

• open a PR in https://github.com/ipfs/kubo that uses this in ipfs pin add command and has green CI there as well
  ? (it would speed up review process)

[vlerdman]

@vlerdman thank you for submitting this – any chance you could also:

• open a PR in https://github.com/ipfs/kubo that uses this in ipfs pin add command and has green CI there as well
  ? (it would speed up review process)

@lidel Thanks for such fast feedback! Opened a PR - ipfs/kubo#11074

[hsanjuan]

Triage:

• Will be reviewed and probably going into 0.40.